Phone disconnecting from car incorrectly, bluetooth connection.

I have recently upgraded to a new Sony Ericsson C905 phone after having many problems with my old Sony phone. Turns out this new phone has a problem similar to the old one. My Ford car has bluetooth handsfree built in. Sometimes after using this my phone has no audio after being connected, and has to be re-set (It appears to fully disconnect). It does however work in loudspeaker, as if it thinks it is connected.This has been common to both phones. I spoke to Sony and they just say it must be a problem with the car, though it works fine. It's the phone that seems dodgy. They advised software update but its just new this week, I tried this with the previous phone.Quite frustrating considering the phone is about £370! I can obviously still send it back but apart from that, the phone is good.

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Unable to connect my new iphone to the bluetooth in my car.
I've turned off the blue tooth in my old phone but it only turns off the bluetooth in the car. I have tried to then reconnect my new iphone, which is searching and showing that it has located the bluetooth (blue tooth flashing in car, shows on the sceen for a second and then turns off with message 'no service' phone off. If I turn on the old phone, everything comes back on.
Any ideas?

Be sure the the headset in in 'Pairing' mode.When in pairing mode, the light should be flashing red and blue or have a steady blue.
The put most headsets in pairing mode, turn headset OFF, then hold the power button until it goes into pairing mode as discribed above.
Then you can discover it with your phone or PC. Pin (pass key) should be 0000 (4 Zeros) or try 1111, 1234, 9999

just turn on bluetooth in ur mobile and then turn on ur bluetooth headset by holding the power button for atleast 5 sec and if blinking green light show up it means that it is turned on,if it shows blinking red and green then it is ready to get paired with ur mobile phone so u can straight away connect the bluetooth by selecting handsfree and new device and in the list of divices select hbh608 and get it paired.if it shows a blinking green then hold the volume increase and decrease button at the same time for 5 sec and then the light turns blinking red and green and then u can go to handsfree and new device and select HBH608....its easy try doing that...it workss....

turn the bluetooth on wait 10 seconds after the bluetooth has turned on. after it has turned on hold the (+) & (-) volume buttons at the same time for about 5 seconds. the light on the outside will then start to flash green and red, and it is ready to pair to your phone.

I have the same problem with my phone w610i , I think it is a common problem of this model . My first phone have this problem on the first day and I replaced with new one , after one week the sencond one have the same problem, and some times it shows an error message "Serious error occured,stop using phone contact sonyerricsson" then I need to restart the phone again to use , Only solution is get service from sonyerricsson, bcs it is new model and no spares and softwares awailable on the outside market .